In reply to scar7:
I have owned a Lhotse, and now use a Tupilak, which is quite simply the best jacket that I have ever owned.
The Lhotse was good, it lasted 5 winters, 4 of them Orkney winters during which it was subjected to all kinds of vile weather on a daily basis, but the zip started jamming in the thinner 40denier material, which eventually caused it to fail, and the GoreTex membrane failed at the back of the neck. Replaced the zip myself and still use it for forestry work and dog walking.
I have had the Tupilak for over 30 months now, and it has seen plenty of use on the Lakeland fells (I moved south from Orkney). The thicker 80denier fabric never jams in the zip, and overall feels a lot more robust, despite the jacket weighing the same (~500g). Note that it has less features than the Lhotse, in particular, no side pockets, and no pit zips. But as I said, the best jacket that I have ever owned, absolutely bombproof, and well worth the £265 that I paid for it in a sale (The Climbers Shop).
Can be had for less than £300 now if you shop around (I searched online a few weeks ago).
Post edited at 21:24